CVE-2026-32940

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{"affected": [{"affectedData": [{"product": "siyuan", "vendor": "siyuan-note", "versions": [{"status": "affected", "version": "< 3.6.1"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*", "matchCriteriaId": "E1AA6470-222A-4841-A487-DF65F9859780", "versionEndExcluding": "3.6.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "SiYuan is a personal knowledge management system. In versions 3.6.0 and below, SanitizeSVG has an incomplete blocklist \u2014 it blocks data:text/html and data:image/svg+xml in href attributes but misses data:text/xml and data:application/xml, both of which can render SVG with JavaScript execution. The unauthenticated /api/icon/getDynamicIcon endpoint serves user-controlled input (via the content parameter) directly into SVG markup using fmt.Sprintf with no escaping, served as Content-Type: image/svg+xml. This creates a click-through XSS: a victim navigates to a crafted URL, sees an SVG with an injected link, and clicking it triggers JavaScript via the bypassed MIME types. The attack requires direct navigation to the endpoint or <object>/<embed> embedding, since <img> tag rendering in the frontend doesn't allow interactive links. This issue has been fixed in version 3.6.1."}, {"lang": "es", "value": "SiYuan es un sistema de gesti\u00f3n de conocimiento personal. En las versiones 3.6.0 e inferiores, SanitizeSVG tiene una lista de bloqueo incompleta \u2014 bloquea data:text/html y data:image/svg+xml en atributos href pero omite data:text/xml y data:application/xml, ambos de los cuales pueden renderizar SVG con ejecuci\u00f3n de JavaScript. El endpoint no autenticado /API/icon/getDynamicIcon sirve entrada controlada por el usuario (a trav\u00e9s del par\u00e1metro content) directamente en el marcado SVG usando fmt.Sprintf sin escape, servido como Content-Type: image/svg+xml. Esto crea un XSS de clic: una v\u00edctima navega a una URL manipulada, ve un SVG con un enlace inyectado, y al hacer clic en \u00e9l se activa JavaScript a trav\u00e9s de los tipos MIME omitidos. El ataque requiere navegaci\u00f3n directa al endpoint o incrustaci\u00f3n de /, ya que la renderizaci\u00f3n de la etiqueta en el frontend no permite enlaces interactivos. Este problema ha sido solucionado en la versi\u00f3n 3.6.1."}], "id": "CVE-2026-32940", "lastModified": "2026-06-17T10:36:36.113", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.8, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32940", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-20T19:52:53.104887Z", "version": "2.0.3"}}]}, "published": "2026-03-20T04:16:49.367", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://github.com/advisories/GHSA-6865-qjcf-286f"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/siyuan-note/siyuan/commit/d01d561875d4f744e9f6232f1d4831e3642b8696"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/siyuan-note/siyuan/releases/tag/v3.6.1"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4mx9-3c2h-hwhg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}, {"lang": "en", "value": "CWE-184"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.6.1)"}}], "enrichment": {"confidence": 84.0, "confidence_source": "matching", "scores": [{"score": 84.0, "source": "matching"}]}, "original": {"product": "siyuan", "source": "cna", "vendor": "siyuan-note"}, "product": "siyuan", "vendor": "siyuan"}], "analysis": {"en": {"generated_at": "2026-03-23T19:52:01.510867+00:00", "value": {"mitigation_remediation": ["Upgrade SiYuan to version 3.6.1 or later, which removes the incomplete blocklist and properly sanitizes SVG href attributes."], "summary": {"action": "Immediate Patch", "impact": "Client\u2011side XSS enabling arbitrary JavaScript execution"}, "threat_synthesis": {"affected_systems": "The affected product is SiYuan, a personal knowledge\u2011management system developed by Siyuan\u2011Note. All versions 3.6.0 and earlier are vulnerable to the bypass, while the issue was addressed in release 3.6.1 and later versions are considered fixed.", "description_and_impact": "SiYuan\u2019s SanitizeSVG function contains an incomplete blocklist that rejects data:text/html and data:image/svg+xml but permits data:text/xml and data:application/xml. When the /api/icon/getDynamicIcon endpoint receives user\u2011controlled content via the content parameter, it injects that value directly into SVG markup using fmt.Sprintf without escaping and serves it with a Content\u2011Type of image/svg+xml. This allows an attacker to craft an SVG that contains a link with a data:text/xml MIME type; clicking the link triggers JavaScript execution and results in a click\u2011through cross\u2011site scripting (XSS) vulnerability. The weakness is a classic reflected client\u2011side XSS, classified under CWE\u201179.", "risk_and_exploitability": "The vulnerability has a CVSS base score of 9.3, indicating high severity. EPSS scores below 1% suggest a low probability of widespread exploitation. The issue is not listed in the CISA KEV catalog. Exploitation requires no authentication; a malicious link can be sent to a victim or embedded in a page via <object> or <embed> tags. Successful exploitation can lead to data theft, session hijacking, or other client\u2011side malicious behaviors."}}}}, "created": "2026-03-20T08:52:49.406193+00:00", "updated": "2026-03-25T14:09:28.196085+00:00", "vendors": ["siyuan", "siyuan$PRODUCT$siyuan"]}